| 单词 | 表层或鞘 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔theca〕A case, covering, or sheath, such as the pollen sac of an anther, the spore case of a moss, or the outer covering of the pupa of certain insects.壳，鞘：盖，表层或鞘，如花药的花粉囊，苔藓的孢子壳或菜昆虫的蛹外壳美国传统 |
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